KR102596533B1 - Composting fuel treated with sewage sludge and its treatment method and system - Google Patents

Abstract

The present invention treats domestic sewage sludge, which is a waste resource, and regenerates it as fuel. Instead of simply processing the waste and using it for composting, the present invention processes sewage sludge to improve the waste treatment effect by completely burning it and using it as fuel. It relates to composted fuel and its processing method and system, comprising: a sludge storage means consisting of a silo for dried sludge and a tank for undried sludge; A sludge mixing means constituting a mixing room; means of transportation; A fermentation means consisting of a plurality of fermentation chambers that agitate the sludge and supply air intermittently; A deodorizing/drying means comprising at least two deodorizing/drying chambers that continuously supply air while stirring the compost; Means for removing metallic foreign substances remaining in the decay; A screening means for sorting the compost into fuel and fertilizer; A kneading means for kneading by adding a binder; In treating sewage sludge with a composting fuel regeneration system using sewage sludge, which is configured to sequentially connect pelletizing means for forming pellets, a sludge importing step of separately importing dried sludge and undried sludge; A sludge mixing step of mixing only pure sludge so that the moisture content is 30 to 40%; A fermentation step of fermentation by intermittently introducing air and stirring; A deodorizing/drying step in which air is continuously introduced; A foreign matter removal step of removing metallic foreign substances; A spoilage selection step; A fuel auxiliary remixing step; A kneading step of adding a binder and kneading the dough; By implementing a composting fuel regeneration method using sewage sludge, which sequentially carries out the pelletization step of forming into pellets, 1000 parts by weight of the composted sewage sludge is converted into fuel that is either charcoal powder, coal powder, or charcoal powder obtained by carbonizing coconut. Add 1000 to 2000 parts by weight of auxiliary material, 2000 parts by weight of the mixed mixture, 20 to 100 parts by weight of polyvinyl alcohol to 1000 parts of water, add 100 to 200 parts by weight of dissolved binder, knead, and form sewage sludge into pellets. Obtain used compost fuel.

Description

Composting fuel treated with sewage sludge and its treatment method and system}

The present invention relates to composting fuel obtained by processing sewage sludge, and a method and system for processing the same. By treating domestic sewage sludge, which is a waste resource, and recycling and utilizing it as fuel, the waste is not simply processed and used for composting, but is completely burned. It relates to composted fuel treated with sewage sludge and its treatment method and system, which improves the waste treatment effect by using it as fuel.

Fermenting organic matter and using it as compost is a treatment method that has been used by mankind for a long time. The method of composting organic matter by piling it up in an open field and allowing it to naturally ferment is mainly used.

In modern times, as the population increases and the development of industry increases the amount of various organic wastes such as food waste, sewage sludge, livestock waste, and manure, disposal of organic waste is emerging as a serious problem.

In particular, organic wastes such as sewage and wastewater sludge, food waste, livestock manure, etc. have a high water content and are easily perishable, so if buried in the ground, they can cause serious environmental pollution such as soil pollution and groundwater pollution due to leachate. A large landfill is required, and when organic waste is incinerated, air pollutants such as dioxin are generated, which becomes a secondary source of pollution.

Organic matter that could not be composted in open fields was treated through marine landfill, etc., or through soil landfill. However, recently, marine dumping has been banned, making marine landfill difficult, and in the case of soil landfill, acupuncture water is generated during the decay of organic waste. There is a problem of contaminating groundwater and surrounding rivers, so new treatment methods for organic waste are required.

Recently, methods such as composting, incineration, carbonization, drying, and stabilization/solidification treatment have been proposed, but they have problems such as skyrocketing oil prices, increasing logistics costs, securing pre-treatment sites, and securing space according to processing volume. The biggest problem is that all Waste generated on land must now be resolved on land. Since landfills may be depleted in about 10 years from 2012, the biggest problem is the future waste crisis. In July 2008, the Ministry of Environment announced that landfill sites will be converted into resources, energy, recycling, and fuel. The current situation is that sludge disposal measures that are environmentally friendly and practical to suppress depletion and are environmentally friendly are being developed in various ways together with each local government.

Accordingly, in order to improve these characteristics, the prior art and patent documents that have been developed and patented so far are examined as follows.

Patent Application No. 10-2000-0021125 (April 20, 2000) is a alum or alum obtained by concentrating the organic sludge generated during the organic wastewater treatment process into the sludge concentrate that has gone through the sludge concentration process in the sludge treatment process and the groundwater emitted from the abandoned coal mine site. By adding concentrated liquid with similar properties, it removes bad odors generated from the sludge concentrate and increases the coagulation effect of the sludge, making it easier to start. At the same time, it is sterilized, and then coal powder is added to the started sludge to homogenize it and form it into a certain shape. This relates to a method of manufacturing fuel using organic sludge. Patent Application No. 10-2011-0118149 (November 14, 2011) relates to fuel pellets using sludge. Specifically, the first waste of waste vinyl and waste plastic among sewage sludge and household waste is crushed and mixed to form pellets. By manufacturing the first waste, the first waste is mixed with sewage sludge through primary screening, crushing, drying, secondary grinding, secondary screening and grinding, mixing, forming, and hot air generation processes to produce waste solid fuel (RDF; Refuse). This relates to fuel pellets using sludge manufactured as Derived Fuel. Patent Application No. 10-2013-0053686 (2013.05.13.) relates to a method of manufacturing solid fuel using sewage sludge. A mixture of 30-50% by weight of sewage sludge, 30-50% by weight of food waste, and 10-30% by weight of pig manure is used to select foreign substances such as metal components contained in organic waste with a moisture content of 70% or more, and then grind it to a size of 1 mm or less. A process of producing a microbial culture by cultivating aerobic microorganisms in a fibrous material containing at least one mixture of vermiculite, cocopeat, zeolite, illite, and activated carbon each ground to a size of 50 to 200 mesh. A process of mixing 90 to 95 wt% of the above organic waste with 5 to 10 wt% of microbial cultures and maturing them to remove odors and at the same time adjust the moisture content to 50 to 60%, corn stalks, bean pods, coconuts, palm, and sawdust. And a process of preparing a first additive by pulverizing rice husk to a size of 1 mm or less and mixing at least one additive, 70 to 90% by weight of organic waste aged with the microbial culture and 10 to 10 of the first additive. A process of preparing a primary mixture with a moisture content of about 40 to 50% while mixing 30% by weight, a process of adjusting the moisture content to 20 to 30% while drying the primary mixture in a kiln dryer, and 50 to 70% by weight of alumina. 10 to 20% by weight of sodium nitrate, 5 to 10% by weight of at least one metal compound selected from acetate, chlorate, oxalate, and carbonate, and 5 to 10% by weight of at least one organic solvent selected from methanol, ethanol, benzene, and toluene, and , a process of preparing a second additive by mixing 3 to 7% by weight of a binder of soda carbonate and 3 to 7% by weight of a deodorant of sodium perborate, and pulverizing the second additive 10 into 60 to 90% by weight of the primary mixture. A process of preparing a secondary mixture with a water content of about 10-20% while mixing ~40% by weight, a process of inputting the secondary mixture into a pellet molding machine to produce solid fuel in the form of pellets, and the solid fuel It is characterized by a process of packaging while drying with warm air discharged from the kiln dryer. Patent Application No. 10-2013-0108745 (2013.09.10.) relates to an organic waste treatment agent and a method of converting organic waste into fuel using the same. The organic waste treatment agent contains 60 to 75% by weight of organic acid, 7 to 20% by weight of activated carbon, and zeolite 5. Contains ~20% by weight and 1~5% by weight of functional ingredients, the organic acid includes humic acid and fulvic acid in a weight ratio of 1:0.001~0.1, and the functional ingredient is one or more of mica, feldspar, iron ore, and red clay. Includes. Patent Application No. 10-2013-0109142 (September 11, 2013) relates to an aeration device for an organic residue fermentation plant, which is buried in the width direction on one side of the concrete floor of the fermentation plant where food waste is first fermented and the main supplying air supply. supply pipe; A plurality of branch pipes branched from the main supply pipe and then buried in the longitudinal direction of the fermentation plant; A plurality of air nozzles are installed at regular intervals in each branch pipe and are provided to blow air through the concrete floor; an air diffuser for an organic residue fermentation plant including; The upper end of the air nozzle is formed with an expansion part larger than the diameter of the air nozzle, and the expansion part provides an air diffuser for the organic residue fermentation plant having a hemispherical or funnel shape, so that even if the nozzle is clogged during the collection of fermented food waste, the air is Since it is automatically ventilated upon supply, the acidifying function is not disabled, thereby preventing anaerobicization and promoting fermentation smoothly and efficiently in an aerobic state. Patent Application No. 10-2013-0109144 (2013.09.11.) relates to a method of converting organic waste into fuel, which includes a waste collection step of collecting and collecting organic waste; A processing step of crushing and cake-forming the collected organic waste; A fermentation step of transporting the waste cake to a fermentation plant when crushing and cake formation are completed, and fermenting the waste cake while spraying the leaching wastewater generated in the processing step into the fermentation plant; A drying and grinding step of collecting and drying the waste that has completed fermentation, drying it, and then pulverizing it into a powder form; When drying and grinding are completed, a pellet processing step of processing the dried waste powder into pellets of a certain size by inputting it into a pelletizing device and extruding it provides a method of turning organic residue into fuel, which includes leaching wastewater discarded during organic waste treatment, Rather, by collecting wastewater and using it as a raw material for fuel, the oil content in the organic residue (waste) is increased through a completely opposite idea from the existing method, and through this, the amount of heat is increased, thereby achieving the effect of using it as fuel for thermal power plants. The purpose of Patent Application No. 10-2013-0125377 (2013.10.21.) is to reduce energy waste by quickly and easily removing moisture contained in sludge when manufacturing sludge pellets for sewage. This is done by drying the sewage sludge and turning it into pellets with a moisture content of less than 10%. By removing the polymer that coagulates the sludge and then drying it, the moisture contained in the sludge is easily evaporated to increase drying efficiency, making the sewage sludge pellets. It is a useful invention that can shorten the drying work time and thereby dramatically reduce the waste of energy generated during drying. Patent Application No. 10-2014-0070851 (2014.06.11.) has a calorific value exceeding the national standard for use as a main fuel at low cost when producing solid fuel by mixing sewage sludge with household waste, and contains chlorine, moisture, and ash. , It relates to a manufacturing method of molding sewage sludge into fuel that allows manufacturing solid fuel in the form of pellets at low cost and high efficiency by reducing the amount of ash to below the standard level while satisfying the quality standards for solid fuel according to the amount of sulfur content. The method is to dehydrate sewage sludge with a water content of 97 to 99% or more to a water content of 60 to 70% using a compression dehydrator, and then process it into crushed sludge with a water content of less than 10 to 15% using a rotary impact dryer. Process Department; A household waste treatment process of selecting combustible waste from household waste, crushing it with a shredder, and then processing the shredded material into combustible shredded material with a moisture content of less than 10 to 15% and a calorific value of 5,500 kcal/kg or more using a rotary impact dryer; A shredded material mixing process of mixing shredded sludge with a water content of less than 10 to 15% prepared through the sewage sludge treatment process and the domestic waste treatment process and combustible shredded material with a water content of less than 10 to 15% and a calorific value of 5,500 kcal/kg or more; A molding process of compressing and molding the mixture of sludge shredded material and combustible shredded material mixed by the shredded material mixing process into a pellet form using a molding machine, wherein in the shredded material mixing process, the sludge shredded material and the combustible shredded material are mixed in a ratio of 4:6 to 2:8. The pellets mixed in proportion and compression molded in the above molding process have a calorific value of 4,700 to 4,924 kcal/kg, chlorine 0.94 to 1.1% wt, moisture 5.2 to 6.0% wt, ash 20.1 to 16.1% wt, and sulfur 0.1 to 0.02% wt. It is designed to have a content of . Patent Application No. 10-2020-0021286 (2020.02.20.) relates to a method of manufacturing fertilizer using organic waste, and more specifically, the step of crushing and selecting organic waste and then storing it, and the stored organic waste as a moisture regulator. A first moisture control step of mixing, a step of reacting the organic waste with the first moisture control by mixing it with quicklime, a second moisture control step of mixing the organic waste mixed with the quicklime with an excipient, and the second moisture. This relates to a method of manufacturing fertilizer using organic waste, including a drying step of stirring and drying the controlled organic waste. Patent application No. 10-2020-0139008 (2020.10.26.) is an eco-friendly solid fuel using sewage sludge, which is an eco-friendly solid fuel made by mixing solid fuel additives and sewage sludge. The solid fuel additive is made of natural powder and It is formed by mixing and stirring dehydrated cake-processed organic waste, and the natural powder contains peat moss, red clay powder, activated carbon, and zeolite. Patent Application No. 10-2021-0004445 (January 13, 2021) relates to a method of manufacturing organic fertilizer using organic sludge, and is a storage process in which organic sludge is used as the main raw material and stored in a closed storage tank that is opened only when brought in. ; A composting process in which the organic sludge that has gone through the storage process is transferred to a sealed transfer conveyor, sterilized and dried in a dryer, and then a useful microbial culture solution is added to a storage hopper for primary composting; A maturation process in which the organic sludge that has undergone the above-mentioned composting process is stored in a mixer, mixed with secondary raw materials and useful microorganism culture medium, and then stored in a storage hopper for 1 to 2 days to completely ripen and stabilize; A molding process in which the raw materials that have completely composted through the ripening process are transferred to a pellet molding machine and molded into organic fertilizers in the form of pellets of about 8 to 10 mm; And a completion process of storing the organic fertilizer in the form of pellets completed through the forming process in a storage hopper and then packaging it in a fixed quantity using an automatic packaging machine to complete the organic sludge, which is a waste resource. As organic fertilizer is manufactured by applying a stabilization method using a mass production system to make fertilizer using the active ingredients of rice bran and microbial strains mixed with it, organic fertilizer made of completely composted compost is used to produce fertilizer. It has a higher proportion of organic matter, nitrogen, phosphoric acid, potassium, etc. than fertilizers, and by supplying high-quality nutrients necessary for growth to the soil, it is expected to promote crop growth as well as improve quality and increase in yield. By recycling organic sludge, it is possible to improve crop growth. As soil acidification is suppressed with growth, continuous crop cultivation is possible. At the same time, the cost of eco-friendly farming methods such as organic farming is reduced, and mass production is possible at low cost, making it agriculturally useful, improving the soil environment and efficiently preserving it. There is an effect. Patent Application No. 10-2021-0053429 (2021.04.26.) includes a raw material warehousing step of storing raw materials made of wastewater treatment sludge into a raw material pit for storage; A first transfer step of transferring the raw materials from the raw material pit to a first conveyor belt; A raw material input step of inputting the raw material transported by the first conveyor belt into a blender; An addition step of adding a moisture reduction additive and an odor reduction additive to the blender to reduce moisture and odor of the raw material; A mixing step of mixing the raw materials with an additive for moisture reduction and an additive for odor reduction; A secondary transfer step of transferring the blended mixture to a second conveyor belt; A drying step of drying the mixture transported by the second conveyor belt in a dryer; and a recycling step of recycling the dried mixture discharged from the dryer. Patent Application No. 10-2021-0053631 (April 26, 2021) is for oxidation-fermentation decomposition for reduction and odor reduction of organic waste such as sewage/wastewater impurities, sewage/wastewater sludge, landfill leachate, organic waste liquid, animal and vegetable waste, etc. This relates to enzymes and their manufacturing methods. They are highly effective in decomposing organic matter, heavy metals, salts, hydrocarbons, and chemicals (polymer coagulants, etc.) contained in organic waste, and not only meet general waste treatment standards, but also meet the standards for disposal at 80-160°C. It has high temperature resistance, so it can survive even under high temperature operating conditions and maintain oxidative fermentation activity, which has an advantageous effect in high temperature treatment to remove moisture. Patent Application No. 10-2021-0079943 (2021.06.21.) relates to a method of manufacturing sewage sludge fuel coal using a disk dryer, where sewage sludge is put into a sludge storage tank for temporary storage, and sawdust is put into a sawdust storage tank for temporary storage. an input process, a mixing process of adding the sewage sludge stored in the sludge storage tank and the sawdust stored in the sawdust storage tank into a raw material mixer and stirring them, a drying process of drying the mixed mixture in a disk dryer, and the dried product. A cooling process of transferring the cooled product after cooling it on a cooling transfer conveyor, a moisture supply process of putting the cooled dried product into a mixing conveyor and supplying moisture through a moisture control device, and forming the dried product with the molding aid in a molding machine and then cooling and It includes a molding process for storing, and the disk dryer of the drying process has an inlet through which the mixture is introduced on one side, and an outlet through which the dried material is discharged on the other side, and the upper part is spaced at a certain distance from each other to discharge gas. A dryer main body is formed with a gas room that can be discharged, and a rotatable structure is installed inside the dryer main body, and a plurality of disks are formed on the outer circumferential surface of the central axis. It is heated by steam supplied to the inside, and the mixture is dried and stirred. It includes a main disk rotor, a driving device connected to the rear end of the central axis provided on the disk rotor to rotate the disk rotor, and a steam part for injecting steam, and is installed in a structure surrounding the outer circumference of the dryer main body. It consists of a steam jacket and scrapers formed on the upper part of the steam jacket, arranged alternately between the disks, and suppressing adhesion of the mixture on the disk.

As described above, the sewage sludge treatment methods developed so far and their composition are fermented to remove the foul odor of the sludge. At this time, sawdust, rice husk, earthen manure, etc. are mixed and fermented at the same time as maturation, so the amount of sludge treated is small, and it is used in this case. Air was not supplied smoothly in the fermentation room, causing many problems, and the fermentation rate of the fermented putrefaction was low, causing odor in the finished fuel.

Accordingly, the present invention was developed to improve the fermentation chamber and select fully fermented high-quality compost for use as fuel and compost for fertilizer with a low degree of fermentation among the fermented compost to remove odor and improve thermal power in the compost regenerated as fuel. The purpose is to produce high-quality fertilizer and fuel.

In constructing a system for treating sewage sludge,

A sludge storage means consisting of a silo for dried sludge and a tank for undried sludge; A sludge mixing means constituting a mixing room; means of transportation; A fermentation means consisting of a plurality of fermentation chambers that agitate the sludge and supply air intermittently; A deodorizing/drying means comprising at least two deodorizing/drying chambers that continuously supply air while stirring the compost; Means for removing metallic foreign substances remaining in the decay; A screening means for sorting the compost into fuel and fertilizer; A kneading means for kneading by adding a binder; In treating sewage sludge with a composting fuel regeneration system using sewage sludge, which is configured to sequentially connect pelletizing means for forming pellets, a sludge importing step of separately importing dried sludge and undried sludge; A sludge mixing step of mixing only pure sludge so that the moisture content is 30 to 40%; A fermentation step of fermentation by intermittently introducing air and stirring; A deodorizing/drying step in which air is continuously introduced; A foreign matter removal step of removing metallic foreign substances; A spoilage selection step; A fuel auxiliary remixing step; A kneading step of adding a binder and kneading the dough; By implementing a composting fuel regeneration method using sewage sludge, which sequentially carries out the pelletization step of forming into pellets, 1000 parts by weight of the composted sewage sludge is converted into fuel that is either charcoal powder, coal powder, or charcoal powder obtained by carbonizing coconut. Add 1000 to 2000 parts by weight of auxiliary material, 2000 parts by weight of the mixed mixture, 20 to 100 parts by weight of polyvinyl alcohol to 1000 parts of water, add 100 to 200 parts by weight of dissolved binder, knead, and form sewage sludge into pellets. Obtain used compost fuel.

Here, the sludge import step; The sludge mixing step; The fermentation step and; The deodorizing/drying step; The foreign matter removal step; In the foreign matter removal step, a composting screening step may be performed to select the composted sludge from which the foreign substances have been removed into fuel and fertilizer, so that only the selected pure sludge is obtained to obtain compost for fertilizer.

In the composting fuel recovery system using the sludge, the sludge storage means consists of at least two silos for dry sludge storage, each of which has an inlet, and the discharge part at the bottom is connected in parallel to form a single body, and at the end of the sludge is a meter for measuring the discharge amount. A dry sludge injector is configured to inject the measured dried sludge into the mixing room of the sludge mixing means; The tank storing undried sludge has a cover with a microorganism spraying nozzle on the upper side with sealed slopes, and is equipped with a transfer screw that pushes the sludge in the center of the bottom surface, which is sloped in a wave shape, and a meter that measures the discharge amount at the end of the tank. It is configured to inject the measured sludge into the mixing chamber of the sludge mixing means, wherein the fermentation means consists of a fermentation chamber partitioned by walls on at least three sides, and a plurality of air is supplied to the main supply pipe so that air is evenly supplied to the bottom of the fermentation chamber. Air distribution pipes having injection holes are arranged at regular intervals, and air supply means including a control valve are provided to intermittently supply air; An air dispersion layer is formed by stacking corn stalks, reeds, and rice straws on the upper side of the air supply means at least three times in the order of alternating directions; A wire mesh is placed on the upper side of the air distribution layer so as not to press the air distribution layer, and the deodorizing/drying means constitutes a deodorizing/drying room partitioned by walls on at least three sides, and the air is evenly distributed on the floor of the deodorizing/drying room. Air distribution pipes having a plurality of air injection holes in the main supply pipe are arranged at regular intervals and air supply means are provided to continuously supply air; An air distribution layer is formed by stacking at least three mats made of one of rice straw, corn stalks, and reeds on the upper side of the air supply means so that the directions of the weaving are shifted; A wire mesh is placed on a stand to prevent pressing the mat on the upper side of the air distribution layer, and the last deodorization/drying room is configured to discharge the dried rotting material to a transfer conveyor, and the metal foreign matter removal means is used to remove the fermented sludge from the deodorizing/drying room. An electromagnet is installed on the upper side of the transfer conveyor that is deodorized and dried at the same time and transferred to the sorting means, so that metal foreign substances remaining in the decay are attached to the electromagnet and removed by the magnetic force of the electromagnet, and the sorting means is used as a deodorizing/drying means. As the deodorized/dried rot is transferred to the transfer conveyor, an inlet is formed on one side into which the rot that has been removed from the metal impurities by the metal impurity removal means is injected. It is composed of a cylindrical drum with a number of screening holes formed on the circumferential surface, and the cylindrical drum The inner circumferential surface of the rotor is integrally formed with a guide screw that guides the transfer of the compost. As the drum rotates, high-quality compost first passes through the sorting hole and is selected as fuel-use waste. The remaining compost moves toward the discharge port and flows out through the later sorting hole or outlet. The air supply means consists of a main supply pipe and an air distribution pipe with a spiral corrugated pipe so that the supplied air flows in a whirlwind and is evenly discharged to the end.

The method and device for producing fuel by processing sewage sludge according to the present invention above ferments only pure sludge without mixing other substances such as sawdust, rice husk, or earthen dust, thereby increasing the throughput of sludge and reducing the generation of bad odors during fermentation. In addition, secondary pollution is prevented by minimizing the generation of leachate, and there is no odor when used by selecting high-quality compost and recycling it as fuel. When producing it as fertilizer, only the organic matter contained in the sludge is condensed and effective. It is an eco-friendly method that suppresses soil acidification and provides new effects to improve and efficiently preserve the soil environment.

1 is a process step diagram illustrating the overall embodiment of the present invention.
Figure 2 is a process step diagram illustrating the implementation state of composting fertilizer production of the present invention.
Figure 3 is an illustration of the overall system equipment for carrying out the present invention.
Figure 4 is an exemplary configuration of the undried sludge storage means of the present invention.
Figure 5 is an exemplary configuration of the sludge mixing room of the present invention.
Figure 6 is an exemplary configuration of the fermentation chamber of the fermentation means of the present invention.
Figure 7 is a partial cutaway enlarged view showing the bottom configuration of the fermentation chamber of the present invention.
Figure 8 is an exemplary configuration of a deodorizing/drying room of the deodorizing/drying means of the present invention.
Figure 9 is a partial cutaway enlarged view showing the floor configuration of the deodorizing/drying room of the present invention.
Figure 10 is an exemplary cross-sectional configuration of the main supply pipe of the air supply means of the present invention.
Figure 11 is a cross-sectional view illustrating the configuration of a sorter of the sorting means of the present invention.
Figure 12 is an exemplary configuration of the kneading means and pelletizing means of the present invention.

A system for treating sewage sludge for carrying out the present invention will be described as follows.

In constructing a system for treating sewage sludge,

It consists of a silo for dried sludge (11) that imports and stores undried sludge with a moisture content of 70 to 80% and dried sludge with a moisture content of 10 to 20%, and a tank for undried sludge (15) to store dried sludge and undried sludge. A sludge storage means (10) for separately bringing in;

A sludge mixing means (20) constituting a mixing chamber (21) in which the dried sludge and the undried sludge stored in the sludge storage means (10) are respectively inputted and mixed so that the moisture content is 30 to 40%;

a transport means (30) for transporting the sludge mixed in the sludge mixing means (20) to the fermentation chamber (41);

A fermentation means (40) that constitutes a plurality of fermentation chambers (41) in which the sludge transported by the transfer means (30) is layered and fermented by intermittently supplying air;

A deodorizing/drying means (50) constituting a plurality of deodorizing/drying chambers (51) that continuously supply air to deodorize/dry the fermented fermented product in the fermentation means (40) while stirring it;

A metallic foreign matter removal means (70) for removing metallic foreign substances remaining in the rotting material while transferring the dried spoilage in the deodorizing/drying means (50) to the conveyor (35);

A sorting means (80) for sorting the rotting material from which foreign substances have been removed by the metallic foreign matter removal means (70) into fuel and fertilizer use;

A kneading means (90) for mixing the selected fuel rot with fuel additives and kneading the mixture by adding a binder;

A composting fuel regeneration system using sewage sludge is configured to sequentially connect the pelletizing means 100, which molds the kneaded mixture into pellets.

Here, at least two silos (11) for storing dried sludge in the sludge storage means are configured, and the inlets (12) are each individually configured to be directly entered from a transport vehicle.

In addition, the discharge part 13 formed at the bottom of the silo 11 is connected in parallel to form a single body, and a meter for measuring the discharge amount is installed at the end of the silo, and the measured dry sludge is measured using the dried sludge injector 22. It is configured to evenly feed the sludge into the mixing chamber (21) of the sludge mixing means (20).

The tank 14 for storing undried sludge has a cover 17 with a microbial spray nozzle 18 on the upper side with sealed slopes, and the bottom 15 is formed in a wave shape with the bottom 15 slanted to one point, so that it is located at the bottom. It constitutes a transfer screw (16) that pushes out.

In addition, a meter for measuring the discharge amount is provided at the end of the transfer screw (16) to inject the measured sludge into the mixing chamber (21) of the sludge mixing means (20).

It is easier if the top of the tank 14 is configured to protrude beyond the wall so that sludge loaded in a vehicle can be directly injected18 into the upper side of the tank 14.

Here, the meter configured at the end of the transfer screw 16 of the tank 14 storing the undried sludge may be configured to count the load of the brought in vehicle without being installed.

And the sludge mixing means (20) constitutes a normal mixing room (21) with a simple structure divided by three walls.

The mixing room 21 configured in this way is where the input undried sludge and dried sludge are mixed, and the mixing method using an excavator, which is usually heavy equipment, is used.

At this time, the end of the input means for injecting the dry sludge discharged from the silo 11 and metered into the mixing room 21 is located at the upper center of the mixing room 21, and a corrugated pipe 25 whose position can be freely changed is provided at the end. It can also be configured to spray and inject evenly throughout the mixing room (21).

In the present invention, the transport means 30 refers to an excavator, a commonly used heavy equipment, which not only scoops and transports sludge, but also stirs it.

The fermentation means 40 constitutes a fermentation chamber 41 divided by walls on at least three sides, and a plurality of air injection holes 63 are provided in the main supply pipe 61 to ensure an even supply of air to the bottom of the fermentation chamber 41. The formed air distribution pipes 62 are arranged at regular intervals and an air supply means 60 consisting of a control valve (not shown) is installed to intermittently supply air.

Then, on the upper side of the air supply means 60, corn stalks 42, reeds 43, and rice straws 44 are stacked at least three times in that order, each in a different direction, to form an air distribution layer 45.

A wire mesh 47 is placed on the base 46 so as not to press the air distribution layer 45 laminated on the upper side of the air distribution layer 45.

Here, in constituting the air distribution layer 45, at the bottom, corn stalks 42, reeds 43, and rice straws 44 are stacked in different directions in that order, which serves as the air component of the air supply means 60. The first purpose is to ensure that the air sprayed from the plurality of air injection holes 63 formed in the pipe 62 is evenly spread and supplied to the bottom surface of the fermentation chamber 41, and the second purpose is to ensure that the air is optimal for microorganisms to live and thrive. This is to create the best fermentation conditions for the sludge introduced into the fermentation chamber by creating even conditions on the floor.

In addition, the wire mesh 47 is supported on the pedestal 46 at the top of the air distribution layer 45 to prevent the air distribution layer 45 from being damaged when heavy equipment is used inside the fermentation chamber. The wire mesh at this time is breathable. It is best to configure it so that it does not get crushed even when heavy equipment is placed on it.

The deodorizing/drying means 50 also constitutes a deodorizing/drying room 51 partitioned by walls on at least three sides, and a plurality of air injection holes ( The air distribution pipes 62 forming the 63) are arranged at regular intervals and an air supply means 60 is provided to continuously supply air.

And, on the upper side of the air supply means 60, at least three mats 52 made by weaving one of rice straw, corn stalks, and reeds are stacked so that the directions of the mats are offset from each other to form an air distribution layer 55.

On the upper side of the air distribution layer 55, a wire mesh 57 is placed on a pedestal 56 so as not to press down on the mat 52, and in the last deodorizing/drying room, the dried rot is discharged to the transfer conveyor 35.

Here, the air distribution layer 55 is composed of a mat 52 for the purpose of improving the dispersion power of air and using the mat for a long time rather than requiring activation of microorganisms in the drying room.

It is an established fact that the supply means for supplying air to the fermentation chamber 41 and the drying chamber 51 is connected to the main air supply pipe, and the corn constituting the air distribution layer 45 of the fermentation chamber 41 The bamboo (42), reed (43), and rice straw (44) may be individually woven to form a mat, but when used on uncomposted sludge, it is more effective not to form a mat.

Here, the air supply means 60 consists of the main supply pipe 61 and the air distribution pipe 62 as spiral corrugated pipes so that the supplied air flows in a whirlwind and is evenly discharged to the end.

The metal foreign matter removal means (70) deodorizes and dries the fermented sludge at the same time in the deodorizing/drying means (50) and transfers it to the sorting means (80) using the magnetic force of an electromagnet. It is configured by installing an electromagnet (71) so that metal foreign substances remaining in the decay are attached to the electromagnet and removed.

This configuration is a normal configuration and has no specific specificity, but it is important in configuring the entire system.

However, if necessary, the metal foreign matter removal means 70 may be removed and installed.

The selection means 80 removes metal foreign substances from the metal foreign matter removal means 70 while transferring the deodorized/dried rot from the deodorizing/drying means 50 to the transfer conveyor 35, and then transfers the deodorized/dried rotten matter from the deodorizing/drying means 50 to the conveyor 35 to be introduced. They are equipped to connect with each other.

This sorting means 80 is composed of a cylindrical drum 81 with an inlet 84 formed on one side and a plurality of sorting holes 82 formed on the circumferential surface.

In addition, a guide screw (83) is integrally formed on the inner peripheral surface of the cylindrical drum (81) to guide the transfer of the rot, so that as the cylindrical drum (81) rotates, high-quality rot first escapes through the screening hole (82) and is converted to fuel. The selected and remaining rot is transferred to the outlet (85) and is later discharged or flows to the outlet (85) to be selected for use as fertilizer.

An embodiment of regenerating composted fuel using sewage sludge using the composted fuel recycling system using sewage sludge of the present invention will be described in detail step by step as follows.

Example 1

In treating sewage sludge,

Sludge import stage;

Undried sludge with a moisture content of 70-80% and dried sludge with a moisture content of 10-20% are brought in separately. The dried sludge is stored in a silo, and the undried sludge is placed in a tank, sprinkled with microorganisms, and covered for storage.

Sludge mixing step;

The dried sludge and undried sludge brought in and stored in the sludge loading step are respectively added and mixed, and only pure sludge is mixed so that the moisture content is 30 to 40%.

Here, the gist of the present invention is to control the moisture content by mixing only pure sludge without mixing sawdust or other foreign substances.

Most mixing methods for carrying out this step use an excavator, which is heavy equipment, but to make it easier, it is also possible to use a stirrer equipped with an escalator by stacking the undried sludge and dried sludge in a configuration that discharges the sludge.

Fermentation step;

The sludge mixed in the mixing step is put into a fermentation chamber and fermented by intermittently introducing air and stirring.

At this time, in the present invention, the generation of leachate is minimized by fermenting only pure sludge without any other foreign substances, and the air is distributed evenly on the bottom of the fermentation chamber by the air distribution layer formed on the bottom, so that the sludge is supplied from the bottom layer upward, so that the overall composting is even. Considering the amount of sludge processed, it can be said to be very efficient as the gases generated during fermentation are minimized. In particular, since the materials that make up the air distribution layer are stacked in the order of corn stalks, reeds, and rice straws, the effect of promoting microbial activity can be expected.

Here, the air injected by the control valve of the air supply means that injects air into the bottom of the fermentation chamber is supplied intermittently at regular intervals, creating optimal conditions for microorganisms to be active.

In addition, the injected air will be evenly supplied to the ends while creating a whirlpool as the main supply pipe and air distribution pipe, which constitute the air supply means, are composed of spiral corrugated pipes.

Deodorization/drying step;

In the fermentation step, the fermented rot is transferred to a deodorizing/drying room where air is continuously introduced, and is deodorized and dried to a moisture content of less than 10%.

Deodorization/drying in this way is to minimize the odor generated from composting when it is commercialized.

Therefore, the drying room is different from the fermentation room in that air is continuously supplied.

Here, too, an air diffusion layer is formed by laying a mat made of woven corn stalks, reeds, or rice straws on the floor, so that the air evenly spread on the floor penetrates between the compost and is expected to have the effect of evenly drying the compost.

In addition, the injected air will be evenly supplied to the ends while creating a whirlpool as the main supply pipe and air distribution pipe, which constitute the air supply means, are composed of spiral corrugated pipes.

Foreign matter removal step;

In the deodorizing/drying step, the deodorized/dried rotting is transferred and at the same time, metallic foreign substances remaining in the rotting are adsorbed and removed by an electromagnet.

spoilage selection stage;

In the foreign matter removal step, the rot from which the foreign matter has been removed is selected for fuel and fertilizer.

This step is a very important step in the present invention. As it passes through a strainer made of a cylindrical drum, the well-composted sludge of good quality comes out first and is selected for use as fuel to proceed to the next step. The compost that is lumped or tangled due to poor composting is filtered out first. As it moves toward the outlet, it will later be discharged and packaged for use as fertilizer.

Fuel auxiliary mixing step;

In the composting selection step, 1000 to 2000 parts by weight of a fuel auxiliary material, which is one of charcoal powder, coal powder, or charcoal powder carbonized from coconut, is added to 1000 parts by weight of the compost selected for fuel use.

At this time, the use of charcoal powder, coal powder, or charcoal powder as a fuel auxiliary for composting is to remove the residual odor of composting, suppress smoke generation during combustion, and generate high heat to completely burn the composted sludge.

Here, in configuring the ratio of mixing compost and fuel auxiliary, if there is a lot of fuel auxiliary, the combustion rate will be excellent, but the throughput of sludge will decrease. If the amount of fuel auxiliary is small, the throughput of sludge will increase, but the combustion rate will decrease.

Kneading step;

In the fuel auxiliary remixing step, 2000 parts by weight of the mixture mixed with the fuel auxiliary material is kneaded by adding 20 to 100 parts by weight of polyvinyl alcohol to 1,000 parts by weight of water and 100 to 200 parts by weight of the dissolved binder.

The important purpose of carrying out this step is to ensure that the compost does not break easily when pelletized and maintains its shape and that the mixing of the compost and fuel additives is even.

At this time, glue made from grain powder can be used as a binder, but adhesive ingredients that are harmful to the human body should not be used.

Pelletization step;

In the kneading step, the binder is added and the kneaded mixture is formed into pellets.

In carrying out this step, any existing input/output pellet generator machine may be installed.

However, if the compression force that compresses the compost and fuel additives is satisfied, there will be no problem.

By performing the above steps sequentially, 1,000 to 2,000 parts by weight of a fuel auxiliary material, which is either charcoal powder, coal powder, or charcoal powder carbonized from coconut, is added to 1,000 parts by weight of fermented pure sewage sludge, and 2,000 parts by weight of a mixture. Add 20 to 100 parts by weight of polyvinyl alcohol to 1,000 parts by weight of water, add 100 to 200 parts by weight of dissolved binder, knead, and form into pellets to obtain composted fuel using sewage sludge.

Here, the fuel auxiliary mixing step and the kneading step can be performed at the same time, and it is more effective if the step of performing these steps and completing the pelletizing step is configured with a single machine.

Example 2

In treating sewage sludge,

Sludge import stage;

Undried sludge with a moisture content of 70-80% and dried sludge with a moisture content of 10-20% are brought in separately. The dried sludge is stored in a silo, and the undried sludge is placed in a tank, sprinkled with microorganisms, and covered for storage.

Sludge mixing step;

The dried sludge and undried sludge brought in and stored in the sludge loading step are respectively added and mixed, and only pure sludge is mixed so that the moisture content is 30 to 40%.

Here, the gist of the present invention is to control the moisture content by mixing only pure sludge without mixing sawdust or other foreign substances.

Most mixing methods for carrying out this step use an excavator, which is heavy equipment, but to make it easier, it is also possible to use a stirrer equipped with an escalator by stacking the undried sludge and dried sludge in a configuration that discharges the sludge.

Fermentation step;

The sludge mixed in the mixing step is put into a fermentation chamber and fermented by intermittently introducing air and stirring.

At this time, in the present invention, the generation of leachate is minimized by fermenting only pure sludge without any other foreign substances, and the air is distributed evenly on the bottom of the fermentation chamber by the air distribution layer formed on the bottom, so that the sludge is supplied from the bottom layer upward, so that the overall composting is even. Considering the amount of sludge processed, it can be said to be very efficient as the gases generated during fermentation are minimized. In particular, since the materials that make up the air distribution layer are stacked in the order of corn stalks, reeds, and rice straws, the effect of promoting microbial activity can be expected.

Here, the air injected by the control valve of the air supply means that injects air into the bottom of the fermentation chamber is supplied intermittently at regular intervals, creating optimal conditions for microorganisms to be active.

In addition, the injected air will be evenly supplied to the ends while creating a whirlpool as the main supply pipe and air distribution pipe, which constitute the air supply means, are composed of spiral corrugated pipes.

Deodorization/drying step;

In the fermentation step, the fermented rot is transferred to a deodorizing/drying room where air is continuously introduced, and is deodorized and dried to a moisture content of less than 10%.

Deodorization/drying in this way is to minimize the odor generated from composting when it is commercialized.

Therefore, the drying room is different from the fermentation room in that air is continuously supplied.

Here, too, an air diffusion layer is formed by laying a mat made of woven corn stalks, reeds, or rice straws on the floor, so that the air evenly spread on the floor penetrates between the compost and is expected to have the effect of evenly drying the compost.

In addition, the injected air will be evenly supplied to the ends while creating a whirlpool as the main supply pipe and air distribution pipe, which constitute the air supply means, are composed of spiral corrugated pipes.

Foreign matter removal step;

In the deodorizing/drying step, the deodorized/dried rotting is transferred and at the same time, metallic foreign substances remaining in the rotting are adsorbed and removed by an electromagnet.

spoilage selection stage;

In the foreign matter removal step, the rot from which the foreign matter has been removed is selected for fuel and fertilizer.

This step is a very important step in the present invention. As it passes through a strainer made of a cylindrical drum, the well-composted sludge of good quality comes out first and is selected for use as fuel to proceed to the next step. The compost that is lumped or tangled due to poor composting is filtered out first. As it moves to the outlet side, it later exits and is packaged for fertilizer and composted using sewage sludge.

The present invention has great industrial value as it treats only pure sludge without mixing other foreign substances in treating sewage sludge, reducing the production of leachate and odor while increasing the treatment amount.

10: Sludge storage means 11: Silo 12: Inlet
13: outlet 14: tank 15: bottom
16: transfer screw 17: cover 18: nozzle
20: sludge mixing means 21: mixing room 22: dried sludge injector
30: means of transportation 35: conveyor
40: Fermentation means 41: Fermentation chamber 42: Corn stalks
43: Reed 44: Rice straw 45,55: Air distribution layer
46,56: stand 47,57: wire mesh
50: Deodorizing/drying means 51: Deodorizing/drying room 52: Mat
60: Air supply means 61: Main supply pipe 62: Air distribution pipe
63: Air blow hole
70: Foreign matter removal means 71: Electromagnet
80: Sorting means 81: Cylindrical drum 82: Sorting hole
83: Guide screw 84: Inlet 85: Outlet
90: Kneading means 100: Pelletizing means.

Claims (10)

In treating sewage sludge,
Undried sludge with a moisture content of 70-80% and dried sludge with a moisture content of 10-20% are brought in, the dried sludge is stored in a silo, and the undried sludge is put into a tank and sprinkled with microorganisms to store it. A separately imported sludge import step;
A sludge mixing step of mixing only pure sludge so that the moisture content is 30 to 40% by adding and mixing the dried sludge and undried sludge brought in and stored in the sludge loading step;
A fermentation step of putting the sludge mixed in the mixing step into a fermentation chamber and fermenting it by intermittently introducing air and stirring;
A deodorizing/drying step of deodorizing and drying the fermented fermented fermented product in the fermentation step to a moisture content of less than 10% in a deodorizing/drying room where air is continuously introduced;
A foreign matter removal step of transferring the deodorized/dried rot in the deodorizing/drying step and simultaneously removing metallic foreign substances remaining in the rotting;
A compost selection step of selecting the compost from which foreign substances have been removed in the foreign matter removal step into fuel and fertilizer use;
A fuel auxiliary remixing step of adding 1000 to 2000 parts by weight of a fuel auxiliary material, which is one of charcoal powder obtained by carbonizing coconut, coal powder, or charcoal powder, to 1000 parts by weight of the compost selected for fuel in the composting selection step;
A kneading step of kneading by adding 2000 to 100 parts by weight of polyvinyl alcohol to 1000 parts by weight of water and 100 to 200 parts by weight of a dissolved binder to 2000 parts by weight of the mixture mixed with the fuel auxiliary material in the fuel auxiliary remixing step;
A method for recycling composted fuel using sewage sludge, characterized in that the pelletization step is sequentially performed in the kneading step by adding a binder and forming the kneaded mixture into pellets. In constructing a system for treating sewage sludge,
It consists of a silo for dried sludge (11) that imports and stores undried sludge with a moisture content of 70 to 80% and dried sludge with a moisture content of 10 to 20%, and a tank for undried sludge (15) to store dried sludge and undried sludge. A sludge storage means (10) for separately bringing in;
A sludge mixing means ( 20) and;
a transport means (30) for transporting the sludge mixed in the sludge mixing means (20) to the fermentation chamber (41);
A fermentation means (40) that constitutes a plurality of fermentation chambers (41) in which the sludge transported by the transfer means (30) is layered and fermented by intermittently supplying air;
A deodorizing/drying means (50) constituting a plurality of deodorizing/drying chambers (51) that continuously supply air to deodorize/dry the fermented fermented product in the fermentation means (40) while stirring it;
A metallic foreign matter removal means (70) for removing metallic foreign substances remaining in the rotting material while transferring the dried spoilage in the deodorizing/drying means (50) to the conveyor (35);
A sorting means (80) for sorting the rotting material from which foreign substances have been removed by the metallic foreign matter removal means (70) into fuel and fertilizer use;
A kneading means (90) for mixing the selected fuel rot with fuel additives and kneading the mixture by adding a binder;
A composting fuel regeneration system using sewage sludge, characterized in that it is configured to sequentially connect pelletizing means (100) for forming the kneaded mixture into pellets. In paragraph 1
The sludge import step; The sludge mixing step; The fermentation step and; The deodorizing/drying step; The foreign matter removal step; A composting fuel regeneration method using sewage sludge, characterized in that in the foreign matter removal step, a composting screening step is performed to select the composted waste from which the foreign substances have been removed into fuel and fertilizer purposes, and only the selected pure sludge is obtained as composted fertilizer. . According to paragraph 2,
The sludge storage means includes at least two silos 11 for dry sludge storage, each forming an inlet 12, and the discharge part 13 at the bottom is connected in parallel to form a single body, and a dry sludge injector is installed at the end thereof. (22) configured to inject dried sludge into the mixing chamber (21) of the sludge mixing means;
The tank 14 for storing undried sludge is composed of a cover 17 consisting of a microbial spray nozzle 18 on the upper side with sealed slopes, and a transfer screw ( 16) A composting fuel regeneration system using sewage sludge, characterized in that it is configured to be introduced into the mixing chamber (21) of the sludge mixing means (20). According to paragraph 2,
The fermentation means 40 constitutes a fermentation chamber 41 partitioned by walls on at least three sides, and the bottom of the fermentation chamber 41 is provided with a plurality of air injection holes 63 in the main supply pipe 61 so that air is evenly supplied. Arranging air distribution pipes 62 at regular intervals and providing air supply means 60 consisting of a control valve (not shown) to intermittently supply air;
An air distribution layer (45) is formed by stacking corn stalks (42), reeds (43), and rice straws (44) at least three times on the upper side of the air supply means (60) in that order, each in a different direction;
A spoiled fuel regeneration system using sewage sludge, characterized in that a wire mesh (47) is placed on a pedestal (46) so as not to press the air distribution layer (45) laminated on the upper side of the air distribution layer (45). According to paragraph 2,
The deodorizing/drying means 50 constitutes a deodorizing/drying room 51 partitioned by walls on at least three sides, and a plurality of air injection holes ( Air distribution pipes (62) forming 63) are arranged at regular intervals and air supply means (60) are provided to continuously supply air;
An air distribution layer (55) is formed by stacking at least three mats (52) made of rice straw, corn stalks, or reeds on the upper side of the air supply means (60) with the directions of the mats being woven in a different direction;
A wire mesh 57 is placed on the pedestal 56 to prevent the mat 52 from being pressed on the upper side of the air distribution layer 55, and the last deodorizing/drying room is configured to discharge the dried rot to the transfer conveyor 35. A compostable fuel regeneration system using sewage sludge. According to paragraph 2,
The metallic foreign matter removal means (70) deodorizes and dries the fermented sludge at the same time in the deodorizing/drying means (50) and transfers it to the sorting means (80) using the magnetic force of an electromagnet. A composting fuel regeneration system using sewage sludge, characterized by installing an electromagnet (71) so that metal foreign substances remaining in the composting are attached to the electromagnet and removed. According to paragraph 2,
The sorting means (80) has an inlet (84) on one side so that the deodorized/dried rotten food in the deodorizing/drying means (50) is transferred to the transfer conveyor (35) and the metal foreign matter is removed from the metal foreign matter removal means (70) and then introduced. It consists of a cylindrical drum (81) formed on the circumferential surface with a plurality of screening holes (82), and a guide screw (83) that guides the transfer of the rot is integrally formed on the inner circumferential surface of the cylindrical drum (81) to form a cylindrical drum (81). As the drum (81) rotates, high-quality rot first passes through the sorting hole (82) and is selected as fuel rot, and the remaining rot is transferred to the discharge port (85) and later escapes or flows through the discharge port (85) to be used as fertilizer. A composting fuel regeneration system using sewage sludge, characterized in that it is configured to select. According to claim 5 or 6,
The air supply means (60) uses sewage sludge, characterized in that the main supply pipe (61) and the air distribution pipe (62) are composed of spiral corrugated pipes so that the supplied air flows in a whirlwind and is evenly discharged to the end. Decay fuel regeneration system. delete